What is the ampacity of a 4/0 AWG THHN aluminum conductor connected to a 200-ampere rated circuit breaker?

The correct choice is based on the ampacity of the 4/0 AWG THHN aluminum conductor, which is a factor that considers the wire gauge, material, and insulation type. The 4/0 AWG aluminum conductor has a specific ampacity rating, generally derived from the National Electrical Code (NEC) or local codes.

In this instance, for a 4/0 AWG aluminum conductor using THHN insulation, the ampacity typically falls within the range of 180 amps when considering various factors such as temperature and installation conditions. This rating indicates the maximum amount of electrical current the conductor is designed to carry safely.

The connection to a 200-ampere rated circuit breaker does imply that the conductor can handle the current safely up to its rated capacity without significant risk of overheating, so 180 amps is a suitable choice. The conductor's ampacity should always be less than or equal to the circuit breaker rating to ensure safety and prevent tripping in the event of current overload.

Recognizing the ampacity alters with environmental factors like temperature and installation methods, ensures safety and compliance in electrical installations. Thus, identifying the ampacity of 4/0 AWG THHN aluminum as 180 amps aligns with industry standards, making